diff --git a/docker.mk b/docker.mk
index f208134..1669e7a 100644
--- a/docker.mk
+++ b/docker.mk
@@ -94,5 +94,7 @@
 	@rm -f hello.c hello
 
 .DEFAULT_GOAL:=docker-all
+.MAKEFLAGS += --no-builtin-rules
+.SUFFIXES:
 
 .PHONY:: docker-build